Don't re-use mHistoryFragment

Make a new HistoryFragment every time we enter and exit history to work
around a bug on older platforms where a Fragment's internal state may
not be reset correctly when detached.

Also the HistoryFragment open/close transition is now properly animated
using a custom Animator returned by DragLayout.

Fixes: 33587141
Fixes: 33789131
Fixes: 33789337
Fixes: 34132294
Fixes: 34132998
Fixes: 34134349
Fixes: 34135442

Test: manually verified no crash occurs on API 22, 23, & 24 emulator
Change-Id: Iaefbe2bbf4ca186b6396397579887774ed5906d3